Pin chamfering machine



Aug. 2, 1955 w. H. DOSTERT 2,714,278

PIN CHAMFERING MACHINE Filed June 22, 1955 4 Sheets-Sheet l INVENTOR.

WILLIAM H. DOSTERT \QQQQTM.

ATTO R N EYS Aug. 2, 1955 w. H. DOSTERT 2,714,278

PIN CHAMFERING MACHINE Filed June 22, 1953 4 Sheets-Sheet 2 INVENTOR.

WILLIAM H-DOST'ERT ATTORNEYS Aug. 2, 1955 w. H. DOSTERT PIN CHAMFERING MACHINE 4 Sheets-Sheet 3 Filed June 22, 1955 INVENTOR.

WILLIAM H .DOSTERT ATTORNEYS Aug. 2, 1955 w. H. DOSTERT PIN CHAMFERING MACHINE 4 Sheets-Sheet 4 Filed June 22, 1953 FIG.7.

United States Patent PIN CHAMFERING MACHINE William H. Dostert, Muskegon, Mich, assignor to Continental Motors Corporation, Detroit and Muskegon, MiclL, a corporation of Virginia Application June 22, 1953, Serial No. 363,177

Claims. (Cl. 51137) This invention relates to a machine for chamfering the ends of pins, cylinders or the like, and more particularly to a machine which causes the pins to roll across moving abrasive surfaces which cut the chamfers on the ends of such pins as they move by said rolling across the abrasive surfaces.

At the present time, the normal method of cutting a chamfer on the end of a piston pin, cylinder or similar part provides for facing the ends of the pin on one machine and transferring the part to a second machine for chamfering the ends, where each end must be individually handled and cut. Such a succession of operations, including several manual handling operations, makes the cost of chamfering very high, and in the case of short runs of a particular size, where the cost of tool changes and set up must be added, the total cost becomes excessive. Generally such operations are manually performed, particularly when short runs are had.

The novel and inventive machine here described and claimed is the answer to high pin chamfering costs. In fact, by the use of the machine, the cost is reduced to a fraction of that for normal currently required operations.

The machine shown and described herein, being a preferred embodiment of the invention, employs abrasive belts arranged at the chamfer angles about a bed upon which the pins are caused to move by rolling. The rolling drive for the pins are V-shaped belts that bear upon the pins from above, causing them to roll upon the bed as the belts move toward and past abrasive belts. The abrasive belts being positioned below and to an angle with the rolling pin axis, the circumferential edges of the pin are abraded as the belt drive rolls the pin across the moving abrasive surface. The abrasive belts, moving in a plane at the chamfer angle to the pin axis, abrades a chamfer on the outer peripheral edge of the pin.

The machine is so arranged that short runs of pins of varying diameters and lengths may be accommodated by the machine, provides for changing the angle of each of the abrasive belts, for bringing the abrasive belts closer together or moving them farther apart for shorter or longer pins respectively, for raising or lowering the drive belts to suit larger or smaller diameter pins, for moving the side guides inward or outward to suit shorter or longer pins, etc. The machine has been made extremely flexible in order to provide maximum use Where varying sizes of pins are required to be chamfered, and the runs of a single size are relatively short.

These then are among some of the objects of the invention. An additional object includes the provision of vertically moving abrasive belts to finish cut the ends of the pins prior to the chamfering operation, which belts are embodied in the machine to face the pins to proper size for chamfering.

Other features of the construction will become more apparent as the description of the invention unfolds below. For a visual understanding of the invention, reference may be had to the accompanying drawings in which like parts are referred to by like reference numerals throughout the several views illustrating a preferred embodiment of the invention, and in which:

Fig. 1 is a diagrammatic perspective view of the invention, showing the relationship of some of the principal elements.

Fig. 2 is a side elevational view of the machine.

Fig. 3 is a diagrammatic side elevational view of the Fig. 2 assembly, particularly indicating the flow of pins across the bed past the various abrasive: belts.

Fig. 4 is a plan view of the machine.

Fig. 5 is a fragmentary vertical sectional view of the machine taken substantially on the line 5--5 of Fig. 2.

Fig. 6 is a slightly enlarged end view of the machine taken from the direction indicated by the arrow in Fig. 4'.

Fig. 7 is a fragmentary vertical enlarged sectional view taken substantially on the line 7-7 of Fig. 2.

Fig. 8 is a fragmentary vertical enlarged sectional View of the abrasive belt portion of Fig. 5.

The chamfering machine of this invention for pins 8 consists of a machine base 10, a pin end facing structure 12, a pin end chamfering structure 14, and a pin supporting and driving structure 16, all combined into a flexible unitary machine to chamfer the ends 18 of pins 8 in a continuous automatic manner. The diagrammatic view of Fig. 1 shows the relationship of the various structures as combined in the machine.

The pin supporting the driving structure 16 consists of a bed 20 supported on spaced apart T-bars 22 atfixed to base 10. The bed 20 is generally of channel shape and extends from the forward end of the machine where it assumes an upwardly curving form, portion 24, to the exit end 26, after the pins 8 have been rolled past the end facing and chamfering structures 12 and 14 respectively. On the T-bars 22 and spaced apart horizontally from each other are pin guide bars 28, running parallel to the bed and supported by angles 30 held to the T-bar's by screws 32. The guide bars 28 are supported higher than bed 20 and are designed to permit the pins 3 to roll between them. The guide bars are arranged to be adjustably spaced apart from each other to accommodate varying lengths of pins. Slots in the angles 30 or in T-bars 22 may be used to obtain adjustability, or other more desirable means may be employed therefor.

Above bed 20 is the pin driving and rolling portion of structure 16, consisting of drive belts 34 arranged over parallel pulleys 36 spaced horizontally apart from each other, as in Fig. 2. Hold down tension is applied to the pulleys by means of springs 38 bearing on parallel spaced apart horizontal pulley support bars 40. Tensioning screws 42 turning in cross-over members 44 apply compressive force to springs 38 to increase the load on the pin driving belts 34, to cause the pins 8 to roll along bed 20. A drive pulley 46 is mounted on the outboard end of shaft 48 of pulley 36 closest to the exit end of the machine. A motor drive (not shown) is required to drive the belts 34 and is connected to driven pulley 46.

Tension on the drive belts 34 is applied by adjusting the dovetail ends 50, 52 of support bars 40 for the lead pulley 36. By relaxing screws 54, extending the dovetail ends outward to take up the slack developed in drive belts 34, and retightening screws 54 in their new adjusted positions, tension is again applied to the pin rolling belts.

The pin end facing structure 12 consists of abrasive belts 60, vertically arranged on spaced apart pulleys 62, and held in tension by adjusting means (not shown) which is commonly known and used in the art. To cause the abrasive belts 60 to adjust to varying lengths of pins 8 which pass between them, an adjusting screw 64, having a hand wheel 66 on the one end thereof is arranged in a screw block 68 held fixedly on machine base 10. One end of screw 64 is arranged with a right hand thread and the other portion with a left hand thread, .so that upon revolving hand wheel 68, the abrasive belts 60 are brought closer together or spread farther apart to suit the length of pins then being end faced prior to chamfering. The abrasive belts 60 are rotated so that they bear downwardly against the pin ends 18, by means of motor drives 70.

The side guide bars 28 which guide the rolling pins along bed 20 are terminated on each side of abrasive belts 60 to permit the end facing operation.

The chamfering of pin ends 18 are accomplished by means of the chamfering structure 14 which includes two identical abrasive belt units 72 spaced apart from each other and arranged on opposite sides of bed 20 to chamfer each end 18 of pin 8. The description of one of these belt structures 72 will serve for both units, it being clearly understood that both units are embodied in the machine, but may be used singly or together as required.

The chamfering unit 72 consists of an abrasive belt 74, a pair of spaced apart belt pulleys 76 over which the belt rides and by which it is driven, side frame bars 78 supporting the pulleys 76, a frame support 80 mounted on base 10, an angularity linkage 82, and a motor drive 84.

Abrasive belt pulleys 76 are mounted on shafts 86 which are mounted in turn in the side frame bars 78. The upper pulley 76 is an idler pulley, the lower one being the driver pulley and having an outboard pulley 88 driven by motor drive 84. Tensioning of the abrasive belt 76 is accomplished by means similar to that described for the side frame elements 40 of the driving and rolling structure 16. Each of the side frame bars 78 are dovetailed to be extendable and screws 90 are used to hold the bars 78 in adjusted position. A mitre gear set 92 having a screw 94 aflixed to one gear causes the dovetailed bars 78 to become shorter or longer, as the other of the two mitre gears is revolved by means of pin 96. Thus, the abrasive belt 74 is tensioned or relaxed as the occasion requires. This means of tensioning is well known in the art and it is not considered necessary to further expand upon its description.

The frame support 80 consisting of a column 98 afiixed to base 10 provides an opening 100 near its top to contain a pivot pin or bolt 102, which holds the bracket 104 for frame side bars 78 in pivoting relationship. The chamfering unit portion supporting the abrasive belt 74 is pivoted on bolt 102 in order to obtain the required chamfer angularity. To adjust to the required chamfer angularity, a linkage 82 is provided, which consists of a support bar 106 mounted on base 10, an adjusting screw 108 rotatably supported in bar 106, and coupled pivoted links 110, whose outer ends 112 are caused to move toward or away from each other upon rotation of adjusting screw 108. The outer ends 112 of links 110 are pivotally affixed to the base and to the side frame bars 78.

One abrasive belt chambering unit 72 is disposed on one side of bed 20, and the other on the opposite side of bed 20 in spaced apart relationship, so that as pins 8 proceed by rolling along bed 20, one pin end 18 is chamfered first by one abrasive belt 74 and then the other pin end 18 is chamfered by the second abrasive belt 74. Figs. 4 and 6 clearly show these relationships.

In operation, the machine of the invention provides for placing the pins 8 to be chamfered on the upwardly curved portion 24 of bed 20 between side guide bars 28. The pins 8 will roll, by gravity, along the bed 20 and under the pin driving and rolling belts 34. As the pins 8 are rolled along bed 20, they are guided between the end facing abrasive belts 60 where the ends 18 are finish cut to size. Being continually revolved by drive belts 34, they pass this .station and are rolled across the first of the moving chamfering abrasive belts 74, which is being moved in a downwardly direction by motor drive 84. Because the pins 8 are rolled across the abrasive belt surface, the entire pin end 18 is chamfered. If both ends of pin 8 require chamfering, the pin is rolled over the second moving abrasive belt 74. Where only one pin end 18 needs chamfering, the second belt chamfering unit 72 need not be in operation, the pin being merely rolled over the stationary abrasive surface.

It will be noted that the angle of chamfer is determined by the adjustment of the linkage 82 with respect to the pivot axis of bolt 102. The exit end 26 of bed 20 may be slightly dipped downwardly, if desired, and the pins 8 will roll oif into a collecting container or onto a conveyor (not shown).

The combination of the end facing structure 12 and the chamfering structure 14 is integrated by the belt driving and rolling structure 16 which causes the pins 8 to roll along bed 20 into and past each of the required operations. Further, the rolling action applied to pins 8 as they pass over the moving abrasive belt surfaces of the chamfering units 72 causes the pin ends 18 to be fully chamfered.

There is a relationship between the width of abrasive chamfer belts 74 and the diameter of pins 8 which should be recognized, in that a pin circumference greater in length than the width of abrasive belt 74 will result in an incomplete chamfer of the pin end 18. This matter, however, is easily resolved by using belts of sufl'lcient width to suit the diameter of pins 8 being passed across them. The width of said abrasive belts are thus designed to be greater than the circumference of the pins.

Single plane abrasive discs may be substituted for rotating abrasive belts. Such means are well known in the art, and may be considered adequate substitutes for the belts. The function and operation of the machine would not be appreciably altered by such substitutes.

It will be apparent to those skilled in the art to which this invention pertains that various modifications and changes may be made without departing from the spirit of the invention or from the scope of the appended claims.

I claim:

1. In combination, a chamfering machine for cylindrical pins consisting of a machine base, a pin rolling bed supported thereon, a roll effecting drive for said pins, movable vertically arranged abrasive belts opposedly posi tioned on either side of said bed contacting the ends of said rolling pins, a pair of movable abrasive belts arranged at an angle to said bed and contacting the outer peripheral edges of said rolling pins, the first of said angularly arranged belts being disposed on the other side of said bed and spaced apart from said first angularly arranged belt, said pin rolling bed extending from a point before said vertically arranged abrasive belts and passing therebetween to a point beyond said second angularly arranged abrasive belts and passing thereover.

2. In combination, a chamfering machine for cylindrical pins consisting of a machine base, a pin rolling bed supported thereon, roll effecting drive means for said pins, movable vertically arranged abrasive belts opposedly positioned on either side of said bed contacting the ends of said rolling pins, and a pair of movable abrasive belts arranged at an angle to said bed and spaced apart from each other on either side of said bed and contacting the outer peripheral edges of said rolling pins, said pin rolling bed extending from a point before said vertically arranged abrasive belts and passing therebetween to a point beyond said angularly arranged abrasive belts and passing thereover.

3. In combination, a chamfering machine for'cylin drical pins consisting of a machine base, a pin rolling bed supported above and upon said base, roll effecting drive means for said pins, vertically arranged abrading means opposedly positioned on either side of said bed contacting the ends of said rolling pins, and a pair of abrading elements arranged at an angle to said bed and spaced apart from each other on either side of said bed and contacting the outer peripheral edges of said rolling pins, said pin rolling bed extending from a point before said vertically arranged abrading means and passing therebetween to a point beyond said angularly arranged abrading elements and passing thereover.

4. In comibnation, a chamfering machine for cylindrical pins consisting of a machine base, a pin rolling bed supported above and upon said base, side pin guides adjustably spaced apart from each other and arranged in cooperating relationship with said bed on said base, roll effecting drive means for said pins disposed above said pin rolling bed, movably vertically arranged abrasive belts opposedly positioned on either side of said bed contacting the ends of said rolling pins, and a pair of movable abrasive belts arranged at an angle to said bed and spaced apart from each other on either side of said bed and contacting the outer peripheral edges of said rolling pins, said pin rolling bed extending from a point before said vertically arranged abrasive belts and passing therebetween to a point beyond said angularly arranged abrasive belts and passing thereover.

5. In combination, a chamfering machine for cylin E11:

drical pins consisting of a machine base, a pin rolling bed supported above and upon said base by T-bars arranged in parallel spaced apart relationship, side pin guides adjustably spaced apart from each other in cooperating relationship with said bed on said T-bars, roll effecting drive means for said pins disposed above said pin rolling bed, movable vertically arranged abrasive belts opposedly positioned on either side of said bed contacting the ends of said rolling pins, and a pair of movable abrasive belts arranged at an angle to said bed and spaced apart from each other on either side of said bed and contacting the outer peripheral edge of said rolling pins, said pin rolling bed extending from a point before said vertically arranged abrasive belts and passing therebetween to a point beyond said angularly arranged abrasive belts and passing thereover.

6. The structure of claim 5, in which said roll effecting drive means consists of horizontally movable means overlying said pins and in pressing contact with said pins.

7. The structure of claim 5, in which said roll effecting drive means consists of movable endless belts overlying said pins and in pressing contact with said pins.

8. The structure of claim 5, in which said roll efiecting drive means consists of driven endless belts supported between belt tensioning pulleys, said belts overly ing said pins and in pressing roll effecting contact with said pins.

9. In combination, a chamfering machine for cylindrical pins consisting of a machine base, a pin rolling bed in the shape of an upturned channel supported upon and above said base by parallel spaced apart T-bars, roll effecting drive means for said pins arranged above and spaced apart from said pin rolling bed, side pin guides adjustably spaced apart from each other on either side and above the plane of said bed on said T-bars and under said roll effecting drive means, and abrading units arranged at an angle to said bed and spaced apart from each other on either side of said bed consisting of tensioned driven abrasive belts moving in contact with the outer peripheral edges of said pins as said pins roll over said abrasive belts.

10. The structure of claim 9, in which said roll effecting means consists of driven endless belts supported between tensioning pulleys, said endless belts overlying said pins and in pressing roll effecting contact with said pins.

11. A chamfering machine for cylindrical pins comprising a base, a pin rolling bed carried by said base, a roll effecting drive for said pins, a pair of movable inclined abrasive belts disposed at an angle to said bed and respectively located on opposite sides of said bed, and contacting the outer peripheral edges of said rolling pins,

said pin rolling bed extending from a point before said abrasive belts and to a point beyond said abrasive belts and passing thereover.

12. A chamfering machine for cylindrical pins comprising a base, a pin rolling bed carried by said base, a roll effecting drive for said pins, a pair of movable inclined abrasive belts disposed at an angle to said bed and respectively located on opposite sides of said bed, and contacting the outer peripheral edges of said rolling pins, said pin rolling bed extending from a point before said abrasive belts and to a point beyond said abrasive belts and passing thereover, said roll effecting drive for said pins comprising pressure means engaging said pins to urge same into pressure contact with said abrasive belts as said pins pass thereover.

13. A chamfering machine for cylindrical pins comprising a base, a pin rolling bed carried by said base, a roll effecting drive for said pins, a pair of movable inclined abrasive belts disposed at an angle to said bed and respectively located on opposite sides of said bed, and contacting the outer peripheral edges of said rolling pins, said pin rolling bed extending from a point before said abrasive belts and to a point beyond said abrasive belts and passing thereover, said movable inclined abrasive belts moving in opposed directions towards the longitudinal center of said pin rolling bed whereby to initially abrasively engage the outer edges of said pins as same are rolled thereover, said roll effective drive for said pins comprising pressure means engaging said pins to urge same into pressure contact with the aforesaid abrasive belts.

14. A chamfering machine for cylindrical pins comprising a base, a pin rolling bed carried by said base, a roll efiecting drive for said pins, a pair of movable inclined abrasive belts disposed at an angle to said bed and respectively located on opposite sides of said bed, and contacting the outer peripheral edges of said rolling pins. said pin rolling bed extending from a point before said abrasive belts and to a point beyond said abrasive belts passing thereover, said movable inclined abrasive belts moving in opposed directions toward the longitudinal center of said pin rolling bed whereby to initially abrasively engage the outer edges of said pins as same are rolled thereover, said roll effective drive for said pins comprising pressure means engaging said pins to urge same into pressure contact with the aforesaid abrasive belts, said abrasive belts having a width greater than the circumferential dimension of said pins.

15. A chamfering machine for cylindrical pins comprising a base, a pin rolling bed carried by said base, a roll effecting drive for said pins, a pair of movable inclined abrasive belts disposed at an angle to said bed and respectively located on opposite sides of said bed, and contacting the outer peripheral edges of said rolling pins, said pin rolling bed extending from a point before said abrasive belts and to a point beyond said abrasive belts and passing thereover, said inclined abrasive belts being longitudinally spaced to successively chamfer one end of said pins and then the other end.

References Cited in the file of this patent UNZTED STATES PATENTS 765,103 Scott July 12, 1904 843,010 Gramelspacher Feb. 5, 1907 844,816 See Feb. 19, 1907 908,977 Dickson Jan. 5, 1909 1,291,179 Schanmburg Ian. 14, 1919 1,797,342 Hitchcock Mar. 24, 1931 2,486,819 Brown Nov. 1, 1949 2,618,910 Cadman Nov. 25, 1952 

